pub fn dp_rec_mc(amount: u32) -> u32 {
    // TODO: 这里写逻辑
    // 贪心实现
    let conins = [100, 50, 30, 20, 10, 5, 2, 1];
    let mut remain = amount;
    let mut cnt :u32 = 0;
    for &conin in conins.iter() {
        if remain == 0 {
            break;
        }
        cnt += remain /conin;
        remain %= conin;
    }
    cnt
}





